執(zhí)行:netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
執(zhí)行后,將會顯示服務器上所有的每個IP多少個連接數(shù)。
以下是我自己用VPS測試的結(jié)果:li88-99:~# netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n1 114.226.9.1321 174.129.237.1571 58.60.118.1421 Address1 servers)2 118.26.131.783 123.125.1.2023 220.248.43.1194 117.36.231.2534 119.162.46.1246 219.140.232.1288 220.181.61.31 VPS偵67.215.242.196
每個IP幾個、十幾個或幾十個連接數(shù)都還算比較正常,如果像上面成百上千肯定就不正常了。 1、安裝DDoS deflatewget http://www.inetbase.com/scripts/ddos/install.sh //下載DDoS deflatechmod 0700 install.sh //添加權(quán)限./install.sh //執(zhí)行 2、配置DDoS deflate
下面是DDoS deflate的默認配置位于/usr/local/ddos/ddos.conf ,內(nèi)容如下:##### Paths of the script and other filesPROGDIR="/usr/local/ddos"PROG="/usr/local/ddos/ddos.sh"IGNORE_IP_LIST="/usr/local/ddos/ignore.ip.list" //IP地址白名單CRON="/etc/cron.d/ddos.cron" //定時執(zhí)行程序APF="/etc/apf/apf"IPT="/sbin/iptables"##### frequency in minutes for running the script##### Caution: Every time this setting is changed, run the script with --cron##### option so that the new frequency takes effectFREQ=1 //檢查時間間隔,默認1分鐘##### How many connections define a bad IP? Indicate that below.NO_OF_CONNECTIONS=150 //最大連接數(shù),超過這個數(shù)IP就會被屏蔽,一般默認即可##### APF_BAN=1 (Make sure your APF version is atleast 0.96)##### APF_BAN=0 (Uses iptables for banning ips instead of APF)APF_BAN=1 //使用APF還是iptables。推薦使用iptables,將APF_BAN的值改為0即可。##### KILL=0 (Bad IPs are'nt banned, good for interactive execution of script)##### KILL=1 (Recommended setting)KILL=1 //是否屏蔽IP,默認即可##### An email is sent to the following address when an IP is banned.##### Blank would suppress sending of mailsEMAIL_TO="root" //當IP被屏蔽時給指定郵箱發(fā)送郵件,推薦使用,換成自己的郵箱即可##### Number of seconds the banned ip should remain in blacklist.BAN_PERIOD=600 //禁用IP時間,默認600秒,可根據(jù)情況調(diào)整
用戶可根據(jù)給默認配置文件加上的注釋提示內(nèi)容,修改配置文件。